Nginx as frontend for apache is not supported, supported are either nginx or apache. The guide you linked to does not apply to current ispconfig versions, so its likely not compatible with current ISPConfig versions.

Hmm... I had no records in System > Server IP addresses. I've only one IP for my server. It in System > Server Config >Server > IP Address. But there is no deafult port on System > Server Config > Web page.

I tryed create new record for the same IP address and port 82 on System > System IP page and set the IP on Sites -> Websites page, but nothing to change and my site answer at port 80.

Ensure that you selected the IP address and not * in the website settings of this website in ISPConfig and that port 82 is set for this IP address under System > ServerIP and that the namevirtualhost checkbox in the IP settings is enabled.